The instability of the SS 433 precession period

Details The instability of the SS 433 precession period The instability of the SS 433 precession period

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982sval....8..249k&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 8, Aug. 1982, p. 461-466) Soviet Astronomy Letters (ISSN 0360-0327), vol. 8, July-Aug.

Astronomy and Astrophysics

Astronomy

5

Binary Stars, Periodic Variations, Precession, Spectral Energy Distribution, Stellar Spectrophotometry, X Ray Stars, Doppler Effect, Emission Spectra, Line Spectra, Red Shift, Variable Stars

Scientific paper

Spectroscopic observations of SS 433 with the 6-m telescope in June-July 1980 and June 1981 demonstrate that the 165 d period of spectral and photometric variability, identified with the precession period of the relativistic jets issuing from the system, has shortened markedly since 1978. The average rate of change in the period for 1978-1981 (if the rate is constant) is -1.26 d + or - 0.10 d, or -0.0078 + or - 0.0006. There are, however, indications that the rate is variable. The Doppler shifts z(+),z(-) behaved in a complicated manner during the strong flare of the system in July 1980, and the mean velocity of jet extrusion from the system was 4000 km/sec greater in the summer of 1981 than in 1978-1979.

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